Rabble-arm and rake.



No. 776,085. PATENTED NOV. 29, 1904.

G. H. REPATH & F. E. MARGY.

RABBLE ARM AND RAKE.

APPLICATION FILED MAR.14, 1904.

N0 MODEL.

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UNITED STATES Patented November 29. 1904-.

PATENT OFFICE.

CHARLES H. REPATH AND FRANK E. MARGY, OF NEXV YORK, N. Y., ASSIGNORS TOFRANK KLEPETKO, OF NEW YORK, N. Y.

RABBLE-ARM AND RAKE.

SPECIFICATION forming part of Letters Patent No. 776,085, dated November29, 1904.

Application filed March 14:, 1904:. Serial No. 198,086. (No model.)

To a whom it may concern:

Be it known that we, CHARLES H. R'EPATIT and FRANK E. MAnoY, citizens ofthe United States, residing at New York, in the county of New York andState of New York, have invented certain new and useful Improvements inRabble-Arms and Rakes, of which the following is a full, clear, andexact description, reference being had to the accompanying drawings,forming a part hereof.

Our invention has relation to improvements in rabble-arms and rakes forroasting-furnaces; and it consists in the novel construction andarrangement of parts more fully set forth in the specification andpointed out in the claims.

In the" drawings, Figure 1 is an elevation of a rabble-arm lookingtoward the advancing face thereof, showing a number of rakes attachedthereto. Fig. 2 is a bottom plan view, the shaft carrying the rabble-armbeing in section on line 2 2 of Fig. 1. Fig. 3 is a transverse verticalsection on line 3 3 of Fig. 1, showing also by dotted lines thedetachable position of the rake or the angle through which it ispreferably swung for purposes of removal from the arm. Fig. 4 is a frontelevation of one of the rakes. Fig. 5 is a top plan view. Fig. 6 is anedge view looking to the left of Fig. 4.. Fig. 7 is an inverted bottomplan looking squarely against the lower edge of the rake, and Fig. 8 isa perspective view of the hooked bar by which the rake is picked upwhile being inserted into position on the rabble-arm or removedtherefrom.

The present invention is applicable to any class of roasting-furnace inwhich rabblearms provided with rakes orv blades are em- .ployed forstirring the ore during the roasting operation. These furnaces may beeither the turret or McDougall type or the straightline furnace, such asthe Ropp or Wethey.

The object of the invention is to overcome objections inherent in theprevailing constructions of rabble-arms and rakes, the most eonspicuousof which is the practical impossibility of removing a rake from arabble-arm should occasion for such a removal arise, as it soonerset-screws, all of which either become loose or they become corroded bythe action of the sulfurous gases from the charge and tightly cementedto the rabble-arm. In other cases the rakes have been strung by a seriesof engaging lips over suitable flanges formed on the rabble-arms forpurposes of making the removal of any rake easy in the event it becomesbroken and a new one must be substituted therefor; but even thisconstruction has its drawbacks for the reason that the lips of the rakesbecome cemented to the flanges of the rabble-arms, and when it becomesnecessary to replace a broken rake the entire series thus cemented mustbe chiseled or broken off their supporting-flanges in order to permitthe new rake to be mounted in proper position, and in the removal of thegood rakes several of these may become broken, so that it causes theoriginal break to be multiplied many times. So, too, must the furnace bestopped and allowed to cool to make such a repair.

With our present invention any rake when broken can be removed and a newone substituted therefor without the necessity of disturbing the goodakes and without the necessity of first cooling the furnace to make the.repair.

The character of rabblear1n to which the present rake is attached isimmaterial, be the same water or air cooled, or be it neither of these,so long as it possesses the details which are essential to effect acoupling with the specific form of rake forming the subject-matter ofthe present invention.

In detail the invention may be described as follows, the rake beingpreferably shown in connection with a rabble-arm as used in the turretor McDougall type of roasting-furnace.

Referring to the drawings, A represents a section of a verticalrotatable hollow shaft, to which the several hollow rabble-arms B areattached. The rabble-arms are made of castiron, and in the presentinstance are of a crosssection, preferably, as shown in Fig. 3. Forconvenience we shall denominate as the advancing face or wall of therabble-arm the side which faces the direction of motion or rotation towhich the arm is subjected during the raking operation. It correspondsto the vertical face from which the rakes are suspended.

Disposed along the lower edge of the advancing face of each rabble-armare a series of suitably-spaced upwardly-turned curved hooks or flanges1, which collectively form a groove or depression for the support of thetrunnions or arms 2 of the rakes or blades C, the body of each bladebeing disposed in a plane making the proper angle with the aXis ofsuspension of the blade in order to not only agitate the ore on thehearth over which the rabble-arm revolves, but to direct the oreradially (in proper direction) to effect the necessary discharge thereoffrom one hearth to the next hearth below, all as fully understood infurnaces of the turret or McDougall type. The position of the center'ofgravity of each rake is such that if left freely suspended from itstrunnions 2 it will assume a substantially vertical position, beinglimited thereto by the shoulder 3, formed in the rear of the blade andbelow the axis of suspension thereof, said shoulder coming squarelyagainst the under surface of the rabble-arm, Fig. 3, and arresting therake against any further oscillation rearwardly. As thus suspended, noupward thrust can possibly dislodge the rake, for the shoulder 3 beingbraced against the rabblearm will resist such thrust, and no horizontalthrust against the advancing face of the rake can dislodge it on accountof the upturned flange 1, which partially envelops the periphery of thetrunnion 2. Thus the rake can neither be lifted in the plane of itssuspension nor dislodged by any force acting against the front oradvancing face of the rake. The latter can, however, be readily detachedif swung forward through an angle suflicient to enable the shoulder 3 toclear the base of the arm B (see dotted position of rake in Fig. 3) whenthe rake can be readily lifted from the arm and as readily placed backagain.

The weakest part of each rake is along the line 20 20, Fig. 4:, so thatif for any cause the rake is caught it can break along this line and nodamage will be done to the arm A or the flanges 1 from which the rake issuspended. In renewing such a broken rake the operator uses a hooked barR, the hooked end of which he inserts into a perforated lug or loop 4:,formed at the upper end of the front face of the rake, thus picking upthe rake and placing the same into position on its supportingflanges,the broken rake being first removed in the same manner. Thus a repaircan be effected without the necessity of cooling the furnace ortampering with any of the rakes which are still in good condition. Ofcourse the insertion of the hook of the bar R into the loop orperforated lug 4 enables the workman to swing the rake to the properangle (substantially ninety degrees) to allow the shoulder 3 to clearthe bottom of the rabblearm, both for purposes of removing a broken rakeor inserting a new one.

While the flanges 1 1 are here shown formed integral with therabble-arm, it is apparent that they might be detachable therefrom orcarried by an independent plate secured to the rabble-arm, as isobvious. The flanges 1 1 are spaced just sufficiently apart to allow forthe body of the blade to swing freely between their adjacent ends, asclearly seen in the drawings.

e do not of course wish to be limited to the precise details here shown,as they may in a measure be departed from without in any wise affectingthe nature or spirit of our invention.

Having described our invention, what we claim is 1. The combination witha rabble-arm, of a rake pivotall y suspended therefrom and adapted to beheld rigid by said arm upon advance of the latter in one direction, therake being detachable when swung to a suitable distance from the arm,substantially as set forth.

2. The combination with a rabble-arm of a rake pivotally suspended fromand bearing against the arm, and being detachable therefrom uponoscillation thereof through a suitable angle from its plane ofsuspension, substantially as set forth.

3. The combination with a rabble-arm of a rake pivotally suspended fromand locked against the arm, and removable therefrom upon oscillationthrough a suitable angle from its plane of suspension, substantially asset forth.

4. The combination with a rabble-arm of a rake having hinge-arms for thepivotal suspension thereof from said arm, and a shoulder adapted to bearagainst the arm and lock the rake against movement upon an advance ofsaid rabble-arm in one direction, substantially as set forth.

5. The combination with a rabble-arm having a series of suitably-spacedcurved flanges disposed along the advancing side thereof, of rakesdisposed in the spaces between the flanges, said rakes having armsresting on the flanges on either side of the spaces for the hingedsuspension of the rakes, and shoulders for hearing against the underside of the arm and locking the rakes against movement with the advanceof said arm, substantially as set forth.

6. A rabble-armhavinga rake pivotally suspended therefrom and lockedthereto against vertical movement, the rake being detachable from thearm when swung through a suitable IIO angle from its plane ofsuspension, substantially as set forth.

7. A rabble-arm having a rake pivotally suspended therefrom and lockedthereto, the rake being detachable from said arm when swung through asuitable angle from its plane of suspensiomsubstantially as set forth.

8. A rake comprising a body portion or blade. terminal arms or trunnionsfrom which the same may be pivotally suspended, and a rear shoulderdisposed below the axis of suspension for engaging the rabble-armcarrying the same, substantially as set forth.

9. A rake comprising a body portion or blade, terminal cylindrical armsor trunnions extending beyond the sides of the blade and at an anglethereto, and a rear shoulder disposed below the suspension-axis of therake for engaging the rabble-arm carrying the same, substantially as setforth.

10. A rake comprising a body portion or blade, terminal oylindioal armsor trunnions extending beyond the sides of the blade and at an anglethereto, a rear shoulder disposed below the suspension-axis of the rakefor engaging the rabble-arm, and a perforated lug for picking up therake, substantially as set forth.

11. A rabble-arm provided with rakes pivotally suspended therefrom andlocked therewith, and liftably removable therefrom upon being swung outof the plane of such suspended position, substantially as set forth.

12. A rabble arm provided with rakes loosely and pivotally suspendedtherefrom and locked therewith against an upward thrust, and liftablyremovable therefrom when swung out of the plane of their suspendedposition, substantially as set forth.

13. A rabble-arm having a series of suitably-spaced flanges, and rakespivotally snspended between said flanges and supported by them,substantially as set forth.

In testimony whereof we aflix our signatures in presence of twowitnesses. V

CHAS. H. REPA'ITH. FRANK E. MARCY. Witnesses:

M. A. Pns'rANA, M. E. RUTLEDGE.

